Display device and package method thereof

ABSTRACT

The present invention provides a display device, including a display panel and an encapsulation cover disposed on the display panel. Two circles of border sealant are sequentially disposed at intervals between the bonding area of the encapsulation cover and the display panel from periphery to the inside. The invention provides a display device, which adopts a novel encapsulation structure so that it can effectively prevent external water and oxygen from invading into the internal display panel, and therefore improve its own stability.

FIELD OF INVENTION

The present invention relates to the field of flat display technology,and in particular, to a display device and a package method thereof, forexample, an organic light emitting diode (OLED) display device, but isnot limited thereto.

BACKGROUND OF INVENTION

It is known that a packaging process is an indispensable process in thestructure of a display panel with a chip, which is used to protect thechip and the display panel to realize their normal use.

Taking large-size OLED television as an example, the package methodsthat are usually used mainly include two types. One is a face sealpackage, and the other is a dam (border sealant)/getter (moistureabsorbent)/filler package.

Further, in a case of the dam sealant/getter/filler package method, onecommon structure is generally that an outer periphery is a dam sealant,and a getter is arranged on an inner side of the dam sealant.Thereafter, a filler is filled on an inside of the getter. And finally,a package is completed by a bonding process.

In the dam sealant/getter/filler package structure, because the fillerhas strong fluidity, the filler often comes in contact with the getteron the outside after bonding. And because the getter used thereinusually contains alkaline metal oxide, when they are in contact, achemical reaction occurs and an alcohol product is produced.

Thus, after a long period of use, with the chemical reaction progresses,the alcohol products produced by the reaction are correspondinglyincreased. The accumulated alcohol products will inevitably affect theorganic light emitting diode (OLED) panel inside, and cause it todeteriorate.

Therefore, when water and oxygen permeate into a dam sealer, and in acase that the getter cannot quickly and completely absorb the intrusivewater vapor, the dam sealer not only cannot prevent the water and oxygenfrom damaging the panel but also cannot prevent the water and oxygenfrom invading the filler through the getter. It will greatly affect aninternal OLED panel.

Therefore, it is necessary to develop a new type of display device andthe package method thereof to overcome the drawbacks of the prior art.

Technical Problem

One aspect of the present invention is to provide a display device thatadopts a novel package structure to effectively insulate external waterand oxygen from intrusion, and thereby improve its stability.

Technical Solution

The technical solution adopted by the present invention is as follows:

A display device, including a display panel and an encapsulation cover,disposed on the display panel.

Two circles of border sealant are sequentially disposed at intervalsbetween the bonding area of the encapsulation cover and the displaypanel from periphery to the inside.

That is to say, it includes an outer border sealant and an inner bordersealant, and the outer border sealant and the inner border sealant arearranged at intervals.

Compared with the current package method of single border sealant, theinvention provides outer border sealant and inner border sealant, suchthat even water vapor and oxygen invade the outer border sealant, thereis still an inner border sealant to block the water vapor and oxygen,thereby display panel inside can work more stable.

Further, in one embodiment, an inner side of the inner border sealant isprovided with filler (fill glue).

Further, in one embodiment, the inner border sealant is provided spacedapart from the filler. The specific distance between the two depends onthe needs, and there is no limit as long as ensuring that they do notcontact each other.

Further, in one embodiment, a desiccant is further disposed between theouter border sealant and the inner border sealant.

The desiccant is used for quickly absorbing water vapor intruding intothe outer border sealant, so that the invaded water vapor does notaccumulate too much, and thus does not cause too much pressure to theinner border sealant.

Further, in one embodiment, the desiccant includes getter, but is notlimited thereto.

Further, in one embodiment, the outer border sealant is provided spacedapart from the desiccant. The specific distance between the two dependson the needs, and there is no limit as long as ensuring that they do notcontact each other.

Further, in one embodiment, the desiccant is provided spaced apart fromthe inner border sealant. The specific distance between the two dependson the needs, and there is no limit as long as ensuring that they do notcontact each other.

Further, in one embodiment, the display panel includes an organic lightemitting diode (OLED) display panel, the OLED display panel sequentiallyincludes a thin film transistor (TFT) array substrate, an OLED devicefunctional layer and a water blocking layer.

Further, in one embodiment, the water blocking layer encapsulates theOLED device functional layer.

Further, in one embodiment, the filler encapsulates the water blockinglayer.

Further, a further aspect of the present invention provides a packagemethod of the display device according to the present invention, whichincludes the following steps:

Step S1, providing a display panel;

Step S2, providing an encapsulation cover, applying an outer bordersealant to an outer periphery of an encapsulation area of theencapsulation cover, and then applying an inner border sealant to aninner side of the outer border sealant spaced from the outer bordersealant;

Step S3, applying a getter to an area between the outer border sealantand the inner border sealant;

Step S4, applying a filler to an area of the inner side of the innerborder sealant; and

Step S5, vacuum bonding the display panel with the encapsulation coverand curing the outer border sealant, the getter, the inner bordersealant, and the filler, thereby an encapsulation of the display panelis completed.

Further, in one embodiment, the outer border sealant, the getter, theinner border sealant, and the filler are cured by ultraviolet radiationor heating.

BENEFICIAL EFFECT

The present invention relates to a display device which is provided withdouble-layered border sealants and in combination with a built-indesiccant. Such that even the water vapor permeates the outer bordersealant and into the display device, the water vapor will be absorbed bythe desiccant. Even if it is not be completely absorbed, there is aninner border sealant to block the water vapor, thereby the stability ofthe display device is effectively improved.

Further, due to the presence of the inner border sealant, it canfunction to limit a flow of the filler disposed on an inner sidethereof. Thus, the filler disposed on the inner side thereof cannotdirectly contact the desiccant. Therefore, they will not cause achemical reaction, and accordingly, no substance will be generated andaccumulated to damage the display panel inside the display device. Itavoids potential danger.

DESCRIPTION OF DRAWINGS

In order to more clearly illustrate the technical solutions in theembodiments of the present invention, the following figures described inthe embodiments will be briefly introduced. It is obvious that thedrawings described below are merely some embodiments of the presentinvention, other drawings can also be obtained by the person ordinaryskilled in the field based on these drawings without doing any creativeactivity.

FIG. 1 is a schematic structural diagram showing a display deviceaccording to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram, showing a display panel usedin step S1 in a method for packaging a display device according to oneembodiment of the present invention;

FIG. 3 is a schematic structural view showing an encapsulation coverafter step S2 in a package method of the display device illustrated inFIG. 2 ;

FIG. 4 is a schematic structural view showing an encapsulation coverafter step S3 in a package method of the display device illustrated inFIG. 2 ; and

FIG. 5 is a schematic structural view showing an encapsulation coverafter step S4 in a package method of the display device illustrated inFIG. 2 .

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

The technical solutions of a display device and a package method thereofaccording to the present invention will be further described in detailbelow with reference to the accompanying drawings and embodiments.

One embodiment of the present invention provides a display panel and anencapsulation cover provided thereon. The display panel may be anorganic light emitting diode (OLED) display panel or a liquid crystaldisplay panel, preferably an OLED display panel.

Hereinafter, an OLED display panel will be described as an example.

Please refer to FIG. 1 , it illustrates a display device according tothe present invention, which includes an OLED display panel and anencapsulation cover provided thereon. The OLED display panel includes athin film transistor (TFT) array substrate 10, on which an OLED devicefunctional layer 20 is disposed. The OLED device functional layer 20 isprovided with a water blocking layer 30, wherein the water blockinglayer 30 can be prepared by low-temperature PECVD method. Theencapsulation cover 40 is disposed on the water blocking layer 30.

Further, an encapsulation area of the encapsulation cover 40 is providedwith an outer sealant 50, a desiccant 60, and an inner sealant 52, whichare arranged at intervals from the periphery to the inside.

A filler 70 is provided inside the inner sealant 52. The desiccant 60may be a Getter glue commonly used in the industry but is not limitedthereto. The border sealant and the filler may all be Dam glue or Fillglue which is commonly used in the industry but is not limited thereto.

The present invention relates to a display device which is provided withdouble-layered border sealants and in combination with a built-indesiccant. Therefore, even the water vapor permeates the outer bordersealant and into the display device, the water vapor will be absorbed bythe desiccant. Even if it is not be completely absorbed, there is aninner sealant to block the water vapor, thereby the stability of thedisplay device is effectively improved.

Further, due to the inner border sealant can function to limit the flowof the filler disposed on the inner side thereof. Thus, the fillerdisposed on the inner side thereof cannot directly contact thedesiccant. Therefore, they will not cause a chemical reaction, andaccordingly, no substance will be generated and accumulated to damagethe display panel inside the display device. It avoids potential danger.

Further, the display device according to the present invention may be alarge-sized television of 50 inches or more, or a large-sized display,depends on the needs, and is not limited.

Further, one embodiment provides a package method of the display deviceaccording to the present invention described above, it includes thefollowing steps:

Step S1, providing a display panel, the display panel may be a liquidcrystal display panel or an organic light emitting diode (OLED) displaypanel, depends on the needs. If adopts an OLED display panel, pleaserefer to FIG. 2 . It includes a thin film transistor (TFT) arraysubstrate 10, on which an OLED device functional layer 20 is disposed,and the OLED device functional layer 20 is provided with a waterblocking layer 30;

Step S2, providing an encapsulation cover 40, applying an outer bordersealant 50 to an outer periphery of an encapsulation area of theencapsulation cover 40, and then applying an inner border sealant 52 toan inner side of the outer border sealant 50 spaced from the outerborder sealant 50. The completed structure is shown in FIG. 3 ;

Step S3, applying a circle of desiccant 60, preferably Getter glue to anarea between the outer border sealant 50 and the inner border sealant52. The desiccant 60 is provided spaced apart from the outer bordersealant 50 and is also spaced apart from the inner border sealant 52.The specific distance between the three can be determined according tothe needs, and there is no limit. The completed structure is shown inFIG. 4 ;

Step S4, applying a filler (Fill glue) 70 to an area of the inner sideof the inner border sealant 52. The completed structure is shown in FIG.5 ; and

Step S5, vacuum bonding the display panel with the encapsulation cover40 and curing the outer border sealant 50, the desiccant 60, the innerborder sealant 52, and the filler 70 by ultraviolet radiation orheating, thereby an encapsulation of the display panel according to theinvention is completed. The completed structure is shown in FIG. 1 .

The description of the above exemplary embodiments is only for thepurpose of understanding the invention. It is to be understood that thepresent invention is not limited to the disclosed exemplary embodiments.It is obvious to those skilled in the art that the above exemplaryembodiments may be modified without departing from the scope and spiritof the present invention.

What is claimed is:
 1. A display device, comprising: a display panel,wherein the display panel comprises a substrate, an organiclight-emitting diode device layer disposed on the substrate, and a waterblocking layer encapsulating the organic light-emitting diode devicelayer; and an encapsulation cover disposed on the display panel; whereinan outer border sealant, a desiccant, and an inner border sealant areprovided between an encapsulation area of the encapsulation cover andthe substrate; wherein the inner border sealant is provided on an innerside of the outer border sealant and is spaced apart from the outerborder sealant, and the desiccant is provided between the outer bordersealant and the inner border sealant; wherein a height of the desiccantis equal to a height of the outer border sealant, a height of the innerborder sealant, and a distance between the encapsulation cover and thesubstrate; and wherein an inner side of the inner border sealant isprovided with a filler spaced apart from the inner border sealant, andthe filler encapsulates the water blocking layer.
 2. The display deviceaccording to claim 1, wherein the desiccant comprises getter.
 3. Thedisplay device according to claim 1, wherein the outer border sealant isdisposed spaced apart from the desiccant.
 4. The display deviceaccording to claim 1, wherein the desiccant is disposed spaced apartfrom the inner border sealant.
 5. The display device according to claim1, wherein the display panel is an organic light-emitting diode displaypanel, and the substrate is a thin film transistor array substrate. 6.An encapsulation method for packaging the display device according toclaim 1, comprising the steps of: Step S1, providing a display panel;Step S2, providing an encapsulation cover, applying an outer bordersealant to an outer periphery of an encapsulation area of theencapsulation cover, and then applying an inner border sealant to aninner side of the outer border sealant spaced from the outer bordersealant; Step S3, applying a getter to an area between the outer bordersealant and the inner border sealant; Step S4, applying a filler to anarea of the inner side of the inner border sealant; and Step S5, vacuumbonding the display panel with the encapsulation cover and curing theouter border sealant, the getter, the inner border sealant, and thefiller, thereby an encapsulation of the display panel is completed. 7.The encapsulation method according to claim 6, wherein the outer bordersealant, the getter, the inner border sealant, and the filler are curedby ultraviolet radiation or heating.